About
=====

DKIMproxy is an SMTP-proxy that implements the DKIM and DomainKeys
standards, to sign and verify email messages using digital signatures
and DNS records. It can be used to add DKIM support to nearly any
existing SMTP mail server. The included instructions show how to
integrate it with Postfix.  It comprises two separate proxies, an
"outbound" proxy for signing outgoing email, and an "inbound" proxy for
verifying signatures of incoming email. With Postfix, the proxies can
operate as either Before-Queue or After-Queue content filters.

See the INSTALL file for installation instructions. Or, check the
website at http://dkimproxy.sourceforge.net/.

DKIMproxy has evolved from my earlier project, Dkfilter. It is based on
smtpprox and Mail::DomainKeys. My thanks go out to Bennett Todd for
providing smtpprox and Anthony D. Urso for providing Mail::DomainKeys.

DKIMproxy is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.

   This code is Copyright (C) 2001 Morgan Stanley Dean Witter, and
   is distributed according to the terms of the GNU Public License
   as found at <URL:http://www.fsf.org/copyleft/gpl.html>.


   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

smtpprox is a trivial transparent SMTP proxy, an SMTP server and
client combination. It uses its own SMTP server and client modules
which are designed to expose every step of the protocol dialogue to
the calling program, which provides for the greatest flexibility in
hooking in envelope and content controls and scanning.

For efficiency reasons, it pre-forks and serves from a pool of
servers, Apache-style.

smtpprox was written by Bennett Todd, <bet@rahul.net>.